{"id":6230,"date":"2026-09-21T08:25:27","date_gmt":"2026-09-21T05:25:27","guid":{"rendered":"https:\/\/aesinn.com\/test-ve-olcum-hizmetleri\/iso-10042-nedir-aluminyum-ve-alasimlarinda-ark-kaynakli-baglantilar-icin-kusur-kabul-seviyeleri-b-c-d\/"},"modified":"2026-09-21T10:58:10","modified_gmt":"2026-09-21T07:58:10","slug":"iso-10042-nedir-aluminyum-ve-alasimlarinda-ark-kaynakli-baglantilar-icin-kusur-kabul-seviyeleri-b-c-d","status":"publish","type":"page","link":"https:\/\/aesinn.com\/en\/test-ve-olcum-hizmetleri\/iso-10042-nedir-aluminyum-ve-alasimlarinda-ark-kaynakli-baglantilar-icin-kusur-kabul-seviyeleri-b-c-d\/","title":{"rendered":"What is ISO 10042? Defect Acceptance Levels (B, C, D) for Arc Welded Joints in Aluminum and Alloys."},"content":{"rendered":"<h2 class=\"wp-block-heading\">What is ISO 10042 and what does it cover?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ISO 10042 is an international standard that defines the acceptable (quality) levels for defects that may occur in arc-welded joints of aluminum and its alloys. Its purpose is to describe the production quality of a welded joint and to establish a systematic framework for determining what defect size is considered acceptable at what level.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The standard covers various joining types such as butt welds, fillet welds, and branch joints, as well as manual, mechanized, and automated welding, and all welding positions. Application areas include arc-based methods such as welding with inert gas-melting wire, welding with tungsten electrodes under inert gas, and plasma arc welding.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An important point is that quality levels refer to manufacturing quality, not the product&#039;s suitability for its intended use. Therefore, level selection is the result of a separate engineering decision that takes into account the loads the part will be subjected to and the design requirements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This content is for informational purposes only; the suitability of a resource to a specific level should be evaluated according to the relevant design and inspection documents.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>Subject: Arc welded joints in aluminum and its alloys.<\/li>\n\n\n<li>Methods covered: wire melting under inert gas, tungsten electrode under inert gas, and plasma arc welding.<\/li>\n\n\n<li>Covered connections: butt, corner and branch welds.<\/li>\n\n\n<li>The levels define product quality, not suitability for use.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">The Difference Between ISO 10042 and ISO 5817: Why a Separate Standard?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ISO 10042 and ISO 5817 are often confused, as both define defect tolerance levels in arc-welded joints using the letters B, C, and D. However, their material coverage differs: ISO 5817 covers steel, nickel, titanium, and their alloys, while ISO 10042 is specifically dedicated to aluminum and its alloys.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This distinction is not accidental. Aluminum&#039;s behavior during welding differs significantly from steel, and its tendency towards porosity and surface oxide layer, in particular, necessitates a separate acceptance framework. Therefore, a steel standard is used for steel, and an aluminum standard for aluminum.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our website covers defect acceptance levels for steel and other metals (ISO 5817), weld inspection and welding procedures and welder qualifications, non-destructive testing methods, and CE processes for steel structures (EN 1090) on separate pages. This page focuses solely on ISO 10042 for aluminum.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>ISO 5817: Steel, nickel, titanium and alloys (on a separate page)<\/li>\n\n\n<li>ISO 10042: Aluminum and its alloys (this page)<\/li>\n\n\n<li>Welding procedures, welder qualifications, and non-destructive testing methods are described on separate pages.<\/li>\n\n\n<li>The root of the difference: the porosity and oxide behavior of aluminum.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What do Quality Levels B, C, and D mean?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The standard defines three quality levels to accommodate a wide range of production. These are designated by the letters B, C, and D. Level B demands the highest requirements on the finished weld; the acceptable defect sizes are the narrowest. Level D defines the most basic requirements and has the relatively widest tolerances. Level C falls between these two.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The stricter the level, the smaller the acceptable dimensions for the same type of defect. For example, a defect such as porosity, oxide residue, or insufficient melting might be evaluated with tighter limits at level B, while a wider range might be acceptable at level D.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The selection of the correct limit depends on factors such as the loads the part will carry, fatigue conditions, safety implications, and design requirements. This selection is the responsibility of the designer, not the standard itself. No hypothetical numerical limits are given in this document; actual limits should always be found in the current text of the standard.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>B: the strictest level, the narrowest acceptance range.<\/li>\n\n\n<li>C: intermediate level<\/li>\n\n\n<li>D: the most basic level, the widest acceptance range.<\/li>\n\n\n<li>Level selection is made according to design and usage conditions.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Challenges in Aluminum Welding: Porosity and Oxide Layer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Aluminum differs from steel in several physical properties from a welding perspective, and ISO 10042 is necessary as a separate standard precisely because it takes these properties into account. The most significant of these is its tendency towards porosity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Aluminum naturally has a hard oxide layer (Al2O3) on its surface with a very high melting point. If this layer is not removed or remains intact during welding, it can lead to defects such as oxide residue and insufficient melting in the melting zone. Aluminum&#039;s high thermal conductivity also causes heat to dissipate rapidly, making melting control difficult.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The most critical issue is hydrogen. In its liquid state, aluminum dissolves hydrogen to a high degree; however, this solubility drops sharply when it solidifies. When the released hydrogen cannot escape, gas pores, or porosity, form. Therefore, porosity is the most characteristic defect of aluminum welds, and aluminum-specific acceptance criteria are based on this behavior.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In aluminum structures under fatigue load, porosity can behave at a lower threshold as a crack initiation point than in steel. This explains why the aluminum standard sets a careful framework regarding porosity.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>Oxide layer (Al2O3): high melting point, risk of oxide residue.<\/li>\n\n\n<li>High thermal conductivity: makes melting control difficult.<\/li>\n\n\n<li>Hydrogen solubility: tendency towards porosity in solidification.<\/li>\n\n\n<li>Typical defects include: porosity, oxide residue, cracks, and insufficient melting.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">EN 1090-3 Relation: Application Classes in Aluminum Structures<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In the manufacture of aluminum load-bearing structures, EN 1090-3 is the implementation standard that defines the technical requirements of the application. This standard establishes a mapping between the application class of the structure and the ISO 10042 quality levels. Thus, more critical application classes demand a stricter quality level from the source, while less critical ones can work with more basic levels.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This structure is the aluminum equivalent of the logic used in steel: while EN 1090-2 in steel structures maps application classes to ISO 5817 levels, EN 1090-3 in aluminum structures performs the same function via ISO 10042 levels. Therefore, the target quality level is often derived from the structure&#039;s application class.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For details of this mapping and its corresponding levels, please refer to the current texts of EN 1090-3 and ISO 10042 standards. The explanations in this section are for informational purposes only and do not replace the level decision in a specific project.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>EN 1090-3: Technical requirements for the manufacture of aluminum structures.<\/li>\n\n\n<li>Application class \u2192 ISO 10042 quality level mapping<\/li>\n\n\n<li>Steel equivalent: EN 1090-2 to ISO 5817 matching (on a separate page)<\/li>\n\n\n<li>The level decision is often derived from the application class.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">The Role and Limitations of AES<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">AES is a Type A inspection body in T\u00fcrkiye, accredited by T\u00dcRKAK only in the 6.1 Electrical Installation field. This text is intended to provide information and create general technical awareness about welding quality and related standards.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AES is not a certification or accredited body; welder qualification certification, welding procedure (WPS) certification, and personnel certification are the responsibility of separate accredited bodies. AES does not issue certificates, grant accreditation, or assign CE marks in these areas. This content is also not an offer of such services.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Determining the appropriate quality level for a specific aluminum welded joint and interpreting the inspection results requires a technical assessment by a qualified engineer, addressing the project-specific conditions. Standard texts, application class requirements, and inspection findings must be considered together.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>AES accreditation is limited to 6.1 Electrical Installation only.<\/li>\n\n\n<li>AES is not a certification or accredited body.<\/li>\n\n\n<li>Welder and procedure certification are the responsibility of separate accredited organizations.<\/li>\n\n\n<li>Level and inspection review requires a technical assessment from a qualified engineer.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Summary and Referral to the Correct Source<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ISO 10042 is a standard that defines the defect acceptance of arc-welded joints in aluminum and its alloys with quality levels B, C, and D. Its distinguishing feature is that it is based on the porosity and oxide behavior specific to aluminum; therefore, it exists as a separate standard from ISO 5817, which is used for steel and other metals.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Level selection depends on the design and application class; in aluminum structures, this connection is usually established via EN 1090-3. Actual defect limits should be determined only by the current text of the standard, not by fabricated values.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For other related topics, please refer to the separate pages on our website: defect acceptance levels for steel and other metals, weld inspection procedures and welder qualifications, non-destructive testing methods, and CE processes in steel structures. This text is for informational purposes only.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>ISO 10042 = Aluminum and alloys defect acceptance (B, C, D)<\/li>\n\n\n<li>ISO 5817 for steel and other metals is on a separate page.<\/li>\n\n\n<li>WPS, welder qualifications, and non-destructive testing methods are on separate pages.<\/li>\n\n\n<li>The current standard text is used as the basis for actual limits.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Related Services<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li><a href=\"https:\/\/aesinn.com\/en\/test-ve-olcum-hizmetleri\/iso-5817-ergitme-kaynakli-baglantilarda-kusur-kabul-seviyeleri-b-c-d-kalite-seviyeleri\/\">ISO 5817 Steel Welding Defect Acceptance Levels (B \/ C \/ D)<\/a><\/li>\n\n\n<li><a href=\"https:\/\/aesinn.com\/en\/test-ve-olcum-hizmetleri\/kaynak-muayenesi-ve-kaynakci-wps-yeterlilik-degerlendirmesi-aws-d1-1-asme-bpvc-section-ix-ve-ts-en-iso-9606\/\">Welding Inspection and Welder \/ WPS Qualification Assessment<\/a><\/li>\n\n\n<li><a href=\"https:\/\/aesinn.com\/en\/test-ve-olcum-hizmetleri\/tahribatsiz-muayene-ndt-yontemleri-vt-pt-mt-ut-rt-ve-et-yontem-bazli-rehber\/\">Non-destructive testing (NDT) methods: VT, PT, MT, UT, RT, and ET.<\/a><\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Which materials does ISO 10042 apply to?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">ISO 10042 applies only to arc welding connections in aluminum and its alloys. Metals such as steel, nickel, and titanium are covered by ISO 5817 and are described on a separate page on our website.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is the difference between quality levels B, C, and D?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">B is the strictest level and has the narrowest defect tolerance range. D is the most basic level and defines the relatively widest tolerances. C is in between the two. The stricter the level, the smaller the allowed defect size.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why is porosity so important in aluminum welding?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In its liquid state, aluminum dissolves a high amount of hydrogen; however, this solubility drops sharply upon solidification, and the released hydrogen gas forms pores. Therefore, porosity is the most characteristic defect of aluminum welding, and ISO 10042 is designed to address this behavior.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Are ISO 10042 and ISO 5817 the same thing?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. Both use levels B, C, and D, but their scopes differ. ISO 5817 is for steel, nickel, and titanium; ISO 10042 is for aluminum and its alloys. The porosity and oxide behavior of aluminum necessitate a separate standard.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How are ISO 10042 and EN 1090-3 related?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">EN 1090-3 specifies the technical requirements for the manufacture of aluminum structures and maps the application class of the structure to the ISO 10042 quality levels. This is the aluminum equivalent of the mapping between EN 1090-2 and ISO 5817 for steel structures.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does AES provide welder or welding procedure certification?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. AES is not a certification or accredited body, and its accreditation is limited to the 6.1 Electrical Installation area. Welder qualifications and procedural and personnel certification are the responsibility of separate accredited bodies. This content is for informational purposes only.<\/p>","protected":false},"excerpt":{"rendered":"<p>ISO 10042, al\u00fcminyum ve ala\u015f\u0131mlar\u0131nda ark kaynakl\u0131 ba\u011flant\u0131lardaki kusurlar i\u00e7in B, C ve D kalite seviyelerini tan\u0131mlar. Bu yaz\u0131, standard\u0131n kapsam\u0131n\u0131 ve al\u00fcminyuma \u00f6zg\u00fc porozite ile oksit davran\u0131\u015f\u0131n\u0131 bilgilendirme ama\u00e7l\u0131 ele al\u0131r.<\/p>","protected":false},"author":1,"featured_media":6235,"parent":2518,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_kad_blocks_custom_css":".transparent-header.content-title-style-hide .content-area{padding-top:140px;}@media (max-width:767px){.transparent-header.content-title-style-hide .content-area{padding-top:90px;}}","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","slim_seo":{"title":"ISO 10042: Aluminum Welding Defect Acceptance (B\/C\/D)","description":"ISO 10042 describes the acceptance of B, C, and D quality levels, as well as porosity and oxide defects, in arc-welded joints of aluminum and its alloys."},"_pplb_hide_from_list":false,"footnotes":""},"class_list":["post-6230","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"taxonomy_info":[],"featured_image_src_large":["https:\/\/aesinn.com\/wp-content\/uploads\/iso10042-aes-kart-1024x1024.png",1024,1024,true],"author_info":{"display_name":"Emre Metin","author_link":"https:\/\/aesinn.com\/en\/author\/yonetim\/"},"comment_info":"","_hostinger_reach_plugin_has_subscription_block":false,"_hostinger_reach_plugin_is_elementor":false,"_links":{"self":[{"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/pages\/6230","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/comments?post=6230"}],"version-history":[{"count":2,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/pages\/6230\/revisions"}],"predecessor-version":[{"id":6239,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/pages\/6230\/revisions\/6239"}],"up":[{"embeddable":true,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/pages\/2518"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/media\/6235"}],"wp:attachment":[{"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/media?parent=6230"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}